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M51971L fiches techniques PDF

Mitsubishi - MOTOR SPEED CONTROL

Numéro de référence M51971L
Description MOTOR SPEED CONTROL
Fabricant Mitsubishi 
Logo Mitsubishi 





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M51971L fiche technique
MITSUBISHI <CONTROL / DRIVER IC>
M51971L/FP
MOTOR SPEED CONTROL
DESCRIPTION
The M51971 is a semiconductor integrated circuit designed to
control the motor rotating speed.
The built-in FG amplifier with high gain enables to use a wide
range of rotating speed detector (FG detector).
Use of less external parts enables DC motors to be controlled with
high precision.
FEATURES
q Wide range of supply voltage • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4 – 17.5V
qVariation coefficient of supply voltage • • • • • ±0.005%/V (standard)
qLoad variation coefficient • • • • • ±0.01% (standard, full load range)
qTemperature coefficient of rotating speed • • • • 7ppm/˚C (standard)
qBuilt-in high performance FG amplifier
APPLICATION
Motor rotating speed control in floppy disk driver, player, tape
recorder, car stereo, etc.
RECOMMENDED OPERATING CONDITIONS
Supply voltage range • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4 – 17.5V
Rated supply voltage • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9V
Input voltage range at pin 1 • • • • • • • • • • • • • • • • • -0.4 – Vcc Note 1
Input voltage range at pin 4 • • • • • • • • • • • • • • • • • • • • • • • • • • -0.4 – Vcc
Highest setup tacho-generator frequency • • • • • • • • • • • • • • • • 2.5kHz
Minimum trigger pulse width (input pulse at pin 4 )
• • • • • • • • • • 40µs Note 2
Note 1: The linear operation range is -0.4 to +0.4V.
Note 2: This condition applies to both periods: from pulse rising to
pulse falling and pulse falling to pulse rising.
PIN CONFIGURATION (TOP VIEW)
Non-inverted input 1
Inverted input 2
Amplifier output 3
Schmitt input 4
Time constant 5
Stabilized voltage 6
GND 7
Integration capacitance 8
Output 9
Power supply 10
Outline 10P5
Non-inverted input 1
Inverted input 2
Amplifier output 3
Schmitt input 4
Time constant 5
10 Power supply
9 Output
8 Integration capacitance
7 GND
6 Stabilized voltage
Outline 10P2-C
BLOCK DIAGRAM
Amplifier Schmitt
output intput
34
Time constant
5
Integration
capacitance
8
Operational
VLS amplifier
Non-inverted input 1
1.9V
Inverted input 2
Schmitt
comparator
Timer
Constant
current
control
Buffer
amplifier
VLS 1.9V
Over-shoot
prevention
circuit
Power supply 10
Stabilized supply
voltage
9 Output
7
GND
6
Stabilized
voltage

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